Safety device.



C. F. ROOT.

v SAFETY DEVICE.

APPLICATION FILED MAR. I7 1915.

Patented Sept. 12, 1916v 2 SHEETS-SHEET I.

W1 TNESSE M A i/111'! y WITED STATES FATE i "i;

onnnnns r. ROOT, or nevnnna, OHIO, nssmivon or ONE-FOURTH or MANSFIELD, omo.

OFFICE.

T BYRON 0. come,

mosaic.

Specificati To all whom it may canoe? 4 ,Be it known'that IQCH' I citizen ofthe Unitedfitates 1 1 sidingat Ravenna,

w and useful kiinpi venien Devices,'offwhichth 11.

fiCfiIlOIi. v This. inventlon rela with means which is attachedto dauto;

the operator, or hand. I Further, the. invention aims. to provide means for interlocking theyreciprocating Work engaging element ,ta ct member so as to render the.

one of the; fingers o th Zfiunember is resisted or it encountersqan ohi ,struction in its path, prior to tllQaCQDJIYIBIlCG- ":inentof the punching, pressing, forming or stamping operation, or in other words, he-

enter into, actual physical contact with the work. i

Another object is toprovide meanswhich .is sensitive to operation by contact with the l finger or hand of the operator, should the fingeror hand he in a position subject to inj uryby the reciprocal Work engaging eletneng, without. actual injury to the finger or Jan Further,'the invention aims to provide a rueture which can be adjusted to operate onnection with material possessed of gvaryiug thicknesses. I

The primary object of the present invention is to provide means-attachable to the in'the'c' nty Portage; 11d State of 0111 0,1have} nented pertain I such fingersior'hand of the operator which can iOne of the objects org-this invention-is; to provide a machine of theftypevset forth'jf:

.Jan 2,1914, Serial No. 809,805. 1 matically interlocks theinovable work en-,v gaging elemehtfupon' contact with any Obs stru'ction or resistancesuch as tho handgof h c rmesisic n kcm ,i-igagln element inoperative 1f Saiicpntad;

fore the reciprocating element is, about to pin 1'0 and stud 11. A. plate 12 having outim Patented Se t-12, 1916.

.SclitilNoll973i wo k engaging element and prevent further novei nent thereof.

A-..fur.tt;ei' object is toprovide means of interlocking and supporting the weight of the reci r0 anner as to prevent the work. on-

ele'rnent from resting upon the be used and automatically operated con- ;i;jointly with the safety devices. shown and described in the applications heretofore filed by me of the typeand class shown'ancl described in ,my parent application filed The preferable specific means employed to accomplish-the objects of-this invention comprise a pawl and" ratchet wheel mechanism which is secured t ftheqwerk engag- 2 lug-element, the ratchetwheel being rotated bya correlated pinion which engages a rack bar that is secureditothe head off the ma chine and a: releasing rod forthe pawljwhich carries "a contact" member and is auto- F i ure liiis all front elevation of a conv t.

'ventional type of a staying machine showmg the invention applied thereto. Fig. 2 is a. side ielevation of Fig. .1. Fig. 3 is a line X of Fig. 2.

In the drawings, reference numeral 1 de picts the bed, 2 an L-shaped bracket, 3 the driving shaft and 4 the driving pulley of a terposed work.

The work engaging element is connected to the driving shaft for reciprocation by a,

link 9 through the medium of the crank Wardly extending ear portions 13 and 14 is preferably attached to the work engaging element by the bolts 15. Stud shafts l and 17 are journaled in ear portions 13 and 14: of

eating Work engaging element in v matioally acti ated to permit. the pawl to p ,cross sectional view of Fig. 2 taken on the V the plate 12 and their ends project therefrom in a horizontal plane.

Pinions l8 and 19 are rigidly secured to one end of the stud shafts and are located between the gihs 5 and the plate 12, the other end of the stud shafts having ratchet "wheels 20 and 21 rigidly secured thereto.

A portion of the teeth of theratchet wheels are omitted leaving a plane surface upon part of the periphery thereof. The pinions 1S and 19 engage the teeth of the rack bars 22 and 23 and rotate the ratchet wheels 20 and 21 when the work engaging element is reciprocated.

A pa wl releasing rod 24 has one end slidably fitted in an aperture formed in the die 7 and carries a contact member 25. The other end of the rod is slidably fitted and guided, in a cap hearing 26. I

Pawls 27 and 28 are pivotally mounted upon the work engaging element and are provided with fingers 29 and 30 to enga e the block 31. The block 31 is adjustab ly fitted to the pawl releasing'rod 24 to proride means of varying 'the relation of the pawls with reference to the teeth of the ratchet wheel. A collar 32 is fitted to the pawl releasing rod to permit the rod to be adjusted to support the contact member spaced apart at varying distances from the work engaging element when it is traveling upon its working movement. I

The operation'of the mechanism is as follows: When movement is imparted to thedriving shaft 3, it reciprocates the work engaging element and the pinions are parwith the teeth of the racks and the pinions in turn partially rotate the ratchet wheels. The pawl releasing rod which is pivotally secured to the work engaging element carries the contact member which is spaced apart from the die 7 leaving a space o'between the work engaging element and said die. The ends of the pawls 27 and 28 are normally hold in a positioii to clear but in close proximity to the teeth of the ratchet wheels by the contact blockltll which is adjustably fitted to the rod and adapted to engage the'fingers 29 and 30 (if the pawls and normally irevent them from dropping by gravity. 1 no obstruction is encountered by the contact member or it isonot resisted before it reaches a pre-dtermined point in its working n1ovement','the work eng'aging element will force the contact member to act upon the work. The engagement of the pinions with the racks and the correlated relation of the teeth of the ratchet wheels are such that the pinions will rotate the ratchet wheels carrying the teeth thereof beyond the ends of the pawls when no obstruction is encountered by the contact member before the work engaging element reaches a predetermined point in its working movement, so that when the pawls drop by gravity they will contact with and slide over i element will continue its movement closing the intervening space a between the die 7 and contact member 28 and at the same time changing the relation of the contact block 31 (as shown in dotted lines, 1 with reference to the fingers of the paw s thereby permitting the pawls to drop by gravity and engage the teeth of the ratchet wheels, se-

curely locking; supporting and preventing further movement of the work engaging element.

In practice the ratchet whcelsare rotated by the pinions to present the plane surfaces thereof underneath the pawls when the work engaging element has reached a predetermined pointin its working movement. which point is preferably located about of an inch from the end, of the working movement of the work engaging clement. When an ()lh struction extraneous to the work is encountercd by the contact member such as the fingers or hands of the operator or theliar c, the releasing bar is actuated to reiease the pawls and they drop'by gravity and engage the teeth of the ratchet wheels as shown in dotted. lines, Fig. 1. ,tially rotated because of their engagement Duplicate pawl and ratchet mechanisms are preferably used'to accomplish the objects herein referred to but it will be apparent to those skilled in the art that a single ratchet mechanism can he used or a tram of pawls and ratchet wheels can be used to provide for finer adjustment of the parts if desired and other immaterial changes may be made without departing from the -with coiiperatlng pressuroelements, one of said elements being movableqtoward the principle or' other, stationary racks, a pawl and ratchet j mechanism which engagcstheliracks, and

means carried by the movable element op erable by pressure to actuate the pawls to lock and support the movable element."

2. in a machine of the clam described,

the combination with two opposing elements cooperatlve toexert a pressure upon mien posed work'nnd one of whichelements is. movable toward ,and from the other, an actuating means'for said elemenhmeans carried by said movable element and spaced apart therefrom, stationary racksrand'menns eoiiperative with the stationary racks to in tel-lock said movable elementwhich is autoing mechanism to lock the work performing element if resistance isnflered to said last mentioned means prior to its acting upon the work.

13. In a safety fievice for machines of the class described, in combination withthe cooperative pressure elements thereof, a lockmg mechanism carried bythe movable elemovable element at a pre-determined point in its working movement.

14. In a safety device for machines equipped with cooperative pressure elements,

one of which is under normal conditions movable toward and from the other, a locking mechanism to prevent movement of the movable element on its working stroke under' abnormal conditions, means formi part of the working face of the movable element for controlling the locking mechanism which is carried by the mo able element, and is operable by an extraneous obstruction to permit the locking mechanism to interlock with the movable element to support and iyevent further movement thereo In testimony whereof I nflix my signature in presence 0 two witnesses.

CHARLES F. ROOT. \Vitnesses:

JOHN H. Coss, PEARL M. Yuxoxm. 

